package com.leansoft.bigqueue.utils;

import java.io.File;
import java.io.IOException;

public class FileUtil {

    /**
     * Only check if a given filename is valid according to the OS rules.
     * <p>
     * You still need to handle other failures when actually creating
     * the file (e.g. insufficient permissions, lack of drive space, security restrictions).
     *
     * @param file the name of a file
     * @return true if the file is valid, false otherwise
     */
    public static boolean isFilenameValid(String file) {
        File f = new File(file);
        try {
            f.getCanonicalPath();
            return true;
        } catch (IOException e) {
            return false;
        }
    }

    public static void deleteDirectory(File dir) {
        if (!dir.exists()) return;
        File[] subs = dir.listFiles();
        if (subs != null) {
            for (File f : dir.listFiles()) {
                if (f.isFile()) {
                    if (!f.delete()) {
                        throw new IllegalStateException("delete file failed: " + f);
                    }
                } else {
                    deleteDirectory(f);
                }
            }
        }
        if (!dir.delete()) {
            throw new IllegalStateException("delete directory failed: " + dir);
        }
    }

    public static void deleteFile(File file) {
        if (!file.exists() || !file.isFile()) {
            return;
        }
        if (!file.delete()) {
            throw new IllegalStateException("delete file failed: " + file);
        }
    }
}
